Ryszard "Peja" Andrzejewski (born September 17, 1976 and known under the pseudonyms Rychu, Onomato, Sykuś, and Dr Pager) is a Polish rap musician, songwriter and producer. He is one of Poland's most popular rappers, best known as the frontman of the Polish rap group Slums Attack. Peja was the recipient of the Fryderyk prize in 2002. Peja comes from Poznan, Poland. During his underground career in the 90's he wrote song Lech Poznań about the football club from his city. Local patriotism until nowadays causes Peja to be a real icon and legend in his hometown.

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